/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty5.handler.codec;

import static java.util.Objects.requireNonNull;

public class DecoderResult {

    private static final DecoderResult SUCCESS = new DecoderResult();

    public static DecoderResult failure(Throwable cause) {
        requireNonNull(cause, "cause");
        return new DecoderResult(cause);
    }

    public static DecoderResult success() {
        return SUCCESS;
    }

    private final Throwable cause;

    protected DecoderResult(Throwable cause) {
        this.cause = requireNonNull(cause, "cause");
    }

    protected DecoderResult() {
        this.cause = null;
    }

    public final boolean isSuccess() {
        return cause == null;
    }

    public final boolean isFailure() {
        return cause != null;
    }

    public final Throwable cause() {
        return cause;
    }

    @Override
    public String toString() {
        if (isSuccess()) {
            return "success";
        }

        String cause = cause().toString();
        return new StringBuilder(cause.length() + 17)
                .append("failure(")
                .append(cause)
                .append(')')
                .toString();
    }
}
